chess pieces disappeared
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Actually, if it's this game, it looks like it is either an odds game or custom challenge.
https://www.chess.com/game/daily/547026491
a game played between two players of different rating where the stronger player is given a disadvantage (like starting with one less rook or getting only 2 minutes on the clock when your opponent gets 10)
I don't know what to do. My best guess is maybe aborting the game and telling the opponent that you didn't agree to an odds game.